scholarly journals Leaf gas exchange characteristics differ among Sonoran Desert riparian tree species

2001 ◽  
Vol 21 (4) ◽  
pp. 233-241 ◽  
Author(s):  
J. L. Horton ◽  
T. E. Kolb ◽  
S. C. Hart
Keyword(s):  
Gas Exchange ◽  
Tree Species ◽  
Sonoran Desert ◽  
Leaf Gas Exchange ◽  
Riparian Tree ◽  
Gas Exchange Characteristics

scholarly journals LEAF GAS EXCHANGE CHARACTERISTICS OF FOUR PAPAYA GENOTYPES DURING DIFFERENT STAGES OF DEVELOPMENT

2001 ◽  
Vol 23 (3) ◽  
pp. 522-525 ◽  
Author(s):  
ELIEMAR CAMPOSTRINI ◽  
OSVALDO KIYOSHI YAMANISHI ◽  
CARLOS A. MARTINEZ
Keyword(s):  
Gas Exchange ◽  
Carica Papaya ◽  
Leaf Gas Exchange ◽  
Carbon Dioxide Concentration ◽  
Field Capacity ◽  
Experimental Period ◽  
Clay Loam ◽  
Clay Loam Soil ◽  
Loam Soil ◽  
Gas Exchange Characteristics

In this research, was used four papaya (Carica papaya L.) genotypes: three from the 'Solo ( Sunrise Solo TJ, Sunrise Solo 72/12 and Baixinho de Santa Amália) group and one from the 'Formosa' group (Know-You 01). They were grown in plastic pots containing a sandy-clay-loam soil subjected to pH correction and fertilization, under greenhouse conditions. Throughout the experimental period plants were subjected to periodic irrigation to maintain the soil humitidy around field capacity. The experiment was conducted 73 days after sowing. In all genotypes, leaf gas exchange characteristics were determined. The net photosynthetic rate (A, mumol m-2 s-1 ), stomatal conductance (g s mol m-2 s-1), leaf temperature (T I, 0C) and intercellular carbon dioxide concentration (ci, muL L-1) on the 4th, 5th, 6th, 7th, 8th and 9th leaves from the plant apex were determined. No significant differences were observed for A, g s, c i, or Tl either among the leaves sampled from any of the genotypes. A was positively correlated with g s and in the other hand T I and g s were negatively correlated. The results suggest that, for 73 DAP, all the sampled papaya leaves functioned as sources of organs.

scholarly journals Photosynthetic traits of five neotropical rainforest tree species: interactions between light response curves and leaf-to-air vapour pressure deficit

2005 ◽  
Vol 48 (5) ◽  
pp. 815-824 ◽  
Author(s):  
Marcelo Schramm Mielke ◽  
Alex-Alan Furtado de Almeida ◽  
Fábio Pinto Gomes
Keyword(s):  
Gas Exchange ◽  
Mathematical Models ◽  
Tree Species ◽  
Vapour Pressure ◽  
Leaf Gas Exchange ◽  
Vapour Pressure Deficit ◽  
Light Response ◽  
Photon Flux ◽  
Neotropical Rainforest ◽  
Photosynthetic Traits

Measurements of leaf gas exchange at different photosynthetic photon flux density (PPFD) levels were conducted in order to compare the photosynthetic traits of five neotropical rainforest tree species, with a special emphasis on empirical mathematical models to estimate the light response curve parameters incorporating the effects of leaf-to-air vapour pressure deficit (D) on the saturated photosynthetic rate (Amax). All empirical mathematical models seemed to provide a good estimation of the light response parameters. Comparisons of the leaf photosynthetic traits between different species needed to select an appropriate model and indicated the microenvironmental conditions when the data were collected. When the vapour pressure deficit inside the chamber was not controlled, the incorporation of linear or exponencial functions that explained the effects of D on leaf gas exchange, was a very good method to enhance the performance of the models.

scholarly journals Differential responses between mature and young leaves of sunflower plants to oxidative stress caused by water deficit

2010 ◽  
Vol 40 (6) ◽  
pp. 1290-1294 ◽  
Author(s):  
Inês Cechin ◽  
Natália Corniani ◽  
Terezinha de Fátima Fumis ◽  
Ana Catarina Cataneo
Keyword(s):  
Water Stress ◽  
Gas Exchange ◽  
Leaf Gas Exchange ◽  
Intercellular Co2 Concentration ◽  
Leaf Age ◽  
Co2 Concentration ◽  
Mature Leaves ◽  
Young Leaves ◽  
Mda Content ◽  
Gas Exchange Characteristics

The effects of water stress and rehydration on leaf gas exchange characteristics along with changes in lipid peroxidation and pirogalol peroxidase (PG-POD) were studied in mature and in young leaves of sunflower (Helianthus annuus L.), which were grown in a greenhouse. Water stress reduced photosynthesis (Pn), stomatal conductance (g s), and transpiration (E) in both young and mature leaves. However, the amplitude of the reduction was dependent on leaf age. The intercellular CO2 concentration (Ci) was increased in mature leaves but it was not altered in young leaves. Instantaneous water use efficiency (WUE) in mature stressed leaves was reduced when compared to control leaves while in young stressed leaves it was maintained to the same level as the control. After 24h of rehydration, most of the parameters related to gas exchange recovered to the same level as the unstressed plants except gs and E in mature leaves. Water stress did not activated PG-POD independently of leaf age. However, after rehydration the enzyme activity was increased in mature leaves and remained to the same as the control in young leaves. Malondialdehyde (MDA) content was increased by water stress in both mature and young leaves. The results suggest that young leaves are more susceptible to water stress in terms of gas exchange characteristics than mature leaves although both went through oxidative estresse.

scholarly journals Divergent phenological and leaf gas exchange strategies of two competing tree species drive contrasting responses to drought at their altitudinal boundary

2018 ◽  
Vol 38 (8) ◽  
pp. 1152-1165 ◽  
Author(s):  
Laura Fernández-de-Uña ◽  
Ismael Aranda ◽  
Sergio Rossi ◽  
Patrick Fonti ◽  
Isabel Cañellas ◽  
...  
Keyword(s):  
Gas Exchange ◽  
Tree Species ◽  
Leaf Gas Exchange

Growth and Leaf Gas Exchange Characteristics in Dalbergia sissoo Roxb. and D. latifolia Roxb. Under Water Deficit

2004 ◽  
Vol 42 (1) ◽  
pp. 157-160 ◽  
Author(s):  
M. Ashraf ◽  
M.Y. Ashraf ◽  
Abdul Khaliq ◽  
Eui Shik Rha
Keyword(s):  
Gas Exchange ◽  
Water Deficit ◽  
Leaf Gas Exchange ◽  
Dalbergia Sissoo ◽  
Gas Exchange Characteristics

scholarly journals Diurnal changes in leaf gas exchange characteristics in the uppermost canopy of a rain forest tree, Dryobalanops aromatica Gaertn. f.

1996 ◽  
Vol 16 (9) ◽  
pp. 779-785 ◽  
Author(s):  
A. Ishida ◽  
T. Toma ◽  
Y. Matsumoto ◽  
S. K. Yap ◽  
Y. Maruyama
Keyword(s):  
Gas Exchange ◽  
Rain Forest ◽  
Leaf Gas Exchange ◽  
Forest Tree ◽  
Diurnal Changes ◽  
Gas Exchange Characteristics
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